source3/registry/reg_backend_db.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Virtual Windows Registry Layer
   4  *  Copyright (C) Gerald Carter                     2002-2005
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /* Implementation of internal registry database functions. */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_REGISTRY
  26
  27 static struct db_context *regdb = NULL;
  28 static int regdb_refcount;
  29
  30 static bool regdb_key_exists(const char *key);
  31 static bool regdb_key_is_base_key(const char *key);
  32
  33 /* List the deepest path into the registry.  All part components will be created.*/
  34
  35 /* If you want to have a part of the path controlled by the tdb and part by
  36    a virtual registry db (e.g. printing), then you have to list the deepest path.
  37    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  38    allows the reg_db backend to handle everything up to
  39    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  40    the reg_printing backend onto the last component of the path (see
  41    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  42
  43 static const char *builtin_registry_paths[] = {
  44         KEY_PRINTING_2K,
  45         KEY_PRINTING_PORTS,
  46         KEY_PRINTING,
  47         KEY_SHARES,
  48         KEY_EVENTLOG,
  49         KEY_SMBCONF,
  50         KEY_PERFLIB,
  51         KEY_PERFLIB_009,
  52         KEY_GROUP_POLICY,
  53         KEY_SAMBA_GROUP_POLICY,
  54         KEY_GP_MACHINE_POLICY,
  55         KEY_GP_MACHINE_WIN_POLICY,
  56         KEY_HKCU,
  57         KEY_GP_USER_POLICY,
  58         KEY_GP_USER_WIN_POLICY,
  59         KEY_WINLOGON_GPEXT_PATH,
  60         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  61         KEY_PROD_OPTIONS,
  62         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  63         KEY_TCPIP_PARAMS,
  64         KEY_NETLOGON_PARAMS,
  65         KEY_HKU,
  66         KEY_HKCR,
  67         KEY_HKPD,
  68         KEY_HKPT,
  69          NULL };
  70
  71 struct builtin_regkey_value {
  72         const char *path;
  73         const char *valuename;
  74         uint32 type;
  75         union {
  76                 const char *string;
  77                 uint32 dw_value;
  78         } data;
  79 };
  80
  81 static struct builtin_regkey_value builtin_registry_values[] = {
  82         { KEY_PRINTING_PORTS,
  83                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  84         { KEY_PRINTING_2K,
  85                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
  86         { KEY_EVENTLOG,
  87                 "DisplayName", REG_SZ, { "Event Log" } },
  88         { KEY_EVENTLOG,
  89                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
  90         { NULL, NULL, 0, { NULL } }
  91 };
  92
  93 /**
  94  * Initialize a key in the registry:
  95  * create each component key of the specified path.
  96  */
  97 static WERROR init_registry_key_internal(const char *add_path)
  98 {
  99         WERROR werr;
 100         TALLOC_CTX *frame = talloc_stackframe();
 101         char *path = NULL;
 102         char *base = NULL;
 103         char *remaining = NULL;
 104         char *keyname;
 105         char *subkeyname;
 106         struct regsubkey_ctr *subkeys;
 107         const char *p, *p2;
 108
 109         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
 110
 111         path = talloc_strdup(frame, add_path);
 112         base = talloc_strdup(frame, "");
 113         if (!path || !base) {
 114                 werr = WERR_NOMEM;
 115                 goto fail;
 116         }
 117         p = path;
 118
 119         while (next_token_talloc(frame, &p, &keyname, "\\")) {
 120
 121                 /* build up the registry path from the components */
 122
 123                 if (*base) {
 124                         base = talloc_asprintf(frame, "%s\\", base);
 125                         if (!base) {
 126                                 werr = WERR_NOMEM;
 127                                 goto fail;
 128                         }
 129                 }
 130                 base = talloc_asprintf_append(base, "%s", keyname);
 131                 if (!base) {
 132                         werr = WERR_NOMEM;
 133                         goto fail;
 134                 }
 135
 136                 /* get the immediate subkeyname (if we have one ) */
 137
 138                 subkeyname = talloc_strdup(frame, "");
 139                 if (!subkeyname) {
 140                         werr = WERR_NOMEM;
 141                         goto fail;
 142                 }
 143                 if (*p) {
 144                         remaining = talloc_strdup(frame, p);
 145                         if (!remaining) {
 146                                 werr = WERR_NOMEM;
 147                                 goto fail;
 148                         }
 149                         p2 = remaining;
 150
 151                         if (!next_token_talloc(frame, &p2,
 152                                                 &subkeyname, "\\"))
 153                         {
 154                                 subkeyname = talloc_strdup(frame,p2);
 155                                 if (!subkeyname) {
 156                                         werr = WERR_NOMEM;
 157                                         goto fail;
 158                                 }
 159                         }
 160                 }
 161
 162                 DEBUG(10,("init_registry_key: Storing key [%s] with "
 163                           "subkey [%s]\n", base,
 164                           *subkeyname ? subkeyname : "NULL"));
 165
 166                 /* we don't really care if the lookup succeeds or not
 167                  * since we are about to update the record.
 168                  * We just want any subkeys already present */
 169
 170                 werr = regsubkey_ctr_init(frame, &subkeys);
 171                 if (!W_ERROR_IS_OK(werr)) {
 172                         DEBUG(0,("talloc() failure!\n"));
 173                         goto fail;
 174                 }
 175
 176                 regdb_fetch_keys(base, subkeys);
 177                 if (*subkeyname) {
 178                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
 179                         if (!W_ERROR_IS_OK(werr)) {
 180                                 goto fail;
 181                         }
 182                 }
 183                 if (!regdb_store_keys( base, subkeys)) {
 184                         werr = WERR_CAN_NOT_COMPLETE;
 185                         goto fail;
 186                 }
 187         }
 188
 189         werr = WERR_OK;
 190
 191 fail:
 192         TALLOC_FREE(frame);
 193         return werr;
 194 }
 195
 196 /**
 197  * Initialize a key in the registry:
 198  * create each component key of the specified path,
 199  * wrapped in one db transaction.
 200  */
 201 WERROR init_registry_key(const char *add_path)
 202 {
 203         WERROR werr;
 204
 205         if (regdb_key_exists(add_path)) {
 206                 return WERR_OK;
 207         }
 208
 209         if (regdb->transaction_start(regdb) != 0) {
 210                 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
 211                 return WERR_REG_IO_FAILURE;
 212         }
 213
 214         werr = init_registry_key_internal(add_path);
 215         if (!W_ERROR_IS_OK(werr)) {
 216                 goto fail;
 217         }
 218
 219         if (regdb->transaction_commit(regdb) != 0) {
 220                 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
 221                 return WERR_REG_IO_FAILURE;
 222         }
 223
 224         return WERR_OK;
 225
 226 fail:
 227         if (regdb->transaction_cancel(regdb) != 0) {
 228                 smb_panic("init_registry_key: transaction_cancel failed\n");
 229         }
 230
 231         return werr;
 232 }
 233
 234 /***********************************************************************
 235  Open the registry data in the tdb
 236  ***********************************************************************/
 237
 238 WERROR init_registry_data(void)
 239 {
 240         WERROR werr;
 241         TALLOC_CTX *frame = talloc_stackframe();
 242         struct regval_ctr *values;
 243         int i;
 244         UNISTR2 data;
 245
 246         /*
 247          * First, check for the existence of the needed keys and values.
 248          * If all do already exist, we can save the writes.
 249          */
 250         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 251                 if (!regdb_key_exists(builtin_registry_paths[i])) {
 252                         goto do_init;
 253                 }
 254         }
 255
 256         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 257                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 258                 if (values == NULL) {
 259                         werr = WERR_NOMEM;
 260                         goto done;
 261                 }
 262
 263                 regdb_fetch_values(builtin_registry_values[i].path, values);
 264                 if (!regval_ctr_key_exists(values,
 265                                         builtin_registry_values[i].valuename))
 266                 {
 267                         TALLOC_FREE(values);
 268                         goto do_init;
 269                 }
 270
 271                 TALLOC_FREE(values);
 272         }
 273
 274         werr = WERR_OK;
 275         goto done;
 276
 277 do_init:
 278
 279         /*
 280          * There are potentially quite a few store operations which are all
 281          * indiviually wrapped in tdb transactions. Wrapping them in a single
 282          * transaction gives just a single transaction_commit() to actually do
 283          * its fsync()s. See tdb/common/transaction.c for info about nested
 284          * transaction behaviour.
 285          */
 286
 287         if (regdb->transaction_start(regdb) != 0) {
 288                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
 289                           "failed\n"));
 290                 werr = WERR_REG_IO_FAILURE;
 291                 goto done;
 292         }
 293
 294         /* loop over all of the predefined paths and add each component */
 295
 296         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 297                 if (regdb_key_exists(builtin_registry_paths[i])) {
 298                         continue;
 299                 }
 300                 werr = init_registry_key_internal(builtin_registry_paths[i]);
 301                 if (!W_ERROR_IS_OK(werr)) {
 302                         goto fail;
 303                 }
 304         }
 305
 306         /* loop over all of the predefined values and add each component */
 307
 308         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 309
 310                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 311                 if (values == NULL) {
 312                         werr = WERR_NOMEM;
 313                         goto fail;
 314                 }
 315
 316                 regdb_fetch_values(builtin_registry_values[i].path, values);
 317
 318                 /* preserve existing values across restarts. Only add new ones */
 319
 320                 if (!regval_ctr_key_exists(values,
 321                                         builtin_registry_values[i].valuename))
 322                 {
 323                         switch(builtin_registry_values[i].type) {
 324                         case REG_DWORD:
 325                                 regval_ctr_addvalue(values,
 326                                         builtin_registry_values[i].valuename,
 327                                         REG_DWORD,
 328                                         (char*)&builtin_registry_values[i].data.dw_value,
 329                                         sizeof(uint32));
 330                                 break;
 331
 332                         case REG_SZ:
 333                                 init_unistr2(&data,
 334                                         builtin_registry_values[i].data.string,
 335                                         UNI_STR_TERMINATE);
 336                                 regval_ctr_addvalue(values,
 337                                         builtin_registry_values[i].valuename,
 338                                         REG_SZ,
 339                                         (char*)data.buffer,
 340                                         data.uni_str_len*sizeof(uint16));
 341                                 break;
 342
 343                         default:
 344                                 DEBUG(0, ("init_registry_data: invalid value "
 345                                           "type in builtin_registry_values "
 346                                           "[%d]\n",
 347                                           builtin_registry_values[i].type));
 348                         }
 349                         regdb_store_values(builtin_registry_values[i].path,
 350                                            values);
 351                 }
 352                 TALLOC_FREE(values);
 353         }
 354
 355         if (regdb->transaction_commit(regdb) != 0) {
 356                 DEBUG(0, ("init_registry_data: Could not commit "
 357                           "transaction\n"));
 358                 werr = WERR_REG_IO_FAILURE;
 359         } else {
 360                 werr = WERR_OK;
 361         }
 362
 363         goto done;
 364
 365 fail:
 366         if (regdb->transaction_cancel(regdb) != 0) {
 367                 smb_panic("init_registry_data: tdb_transaction_cancel "
 368                           "failed\n");
 369         }
 370
 371 done:
 372         TALLOC_FREE(frame);
 373         return werr;
 374 }
 375
 376 /***********************************************************************
 377  Open the registry database
 378  ***********************************************************************/
 379
 380 WERROR regdb_init(void)
 381 {
 382         const char *vstring = "INFO/version";
 383         uint32 vers_id;
 384         WERROR werr;
 385
 386         if (regdb) {
 387                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
 388                           regdb_refcount));
 389                 regdb_refcount++;
 390                 return WERR_OK;
 391         }
 392
 393         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 394                               REG_TDB_FLAGS, O_RDWR, 0600);
 395         if (!regdb) {
 396                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 397                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 398                 if (!regdb) {
 399                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 400                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
 401                                 state_path("registry.tdb"), strerror(errno) ));
 402                         return werr;
 403                 }
 404
 405                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 406         }
 407
 408         regdb_refcount = 1;
 409
 410         vers_id = dbwrap_fetch_int32(regdb, vstring);
 411
 412         if ( vers_id != REGVER_V1 ) {
 413                 NTSTATUS status;
 414                 /* any upgrade code here if needed */
 415                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
 416                            vers_id, REGVER_V1));
 417                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
 418                 if (!NT_STATUS_IS_OK(status)) {
 419                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
 420                                   vstring, REGVER_V1, nt_errstr(status)));
 421                         return ntstatus_to_werror(status);
 422                 } else {
 423                         DEBUG(10, ("regdb_init: stored %s = %d\n",
 424                                   vstring, REGVER_V1));
 425                 }
 426         }
 427
 428         return WERR_OK;
 429 }
 430
 431 /***********************************************************************
 432  Open the registry.  Must already have been initialized by regdb_init()
 433  ***********************************************************************/
 434
 435 WERROR regdb_open( void )
 436 {
 437         WERROR result = WERR_OK;
 438
 439         if ( regdb ) {
 440                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 441                 regdb_refcount++;
 442                 return WERR_OK;
 443         }
 444
 445         become_root();
 446
 447         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 448                               REG_TDB_FLAGS, O_RDWR, 0600);
 449         if ( !regdb ) {
 450                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 451                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 452                         state_path("registry.tdb"), strerror(errno) ));
 453         }
 454
 455         unbecome_root();
 456
 457         regdb_refcount = 1;
 458         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 459
 460         return result;
 461 }
 462
 463 /***********************************************************************
 464  ***********************************************************************/
 465
 466 int regdb_close( void )
 467 {
 468         if (regdb_refcount == 0) {
 469                 return 0;
 470         }
 471
 472         regdb_refcount--;
 473
 474         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 475
 476         if ( regdb_refcount > 0 )
 477                 return 0;
 478
 479         SMB_ASSERT( regdb_refcount >= 0 );
 480
 481         TALLOC_FREE(regdb);
 482         return 0;
 483 }
 484
 485 WERROR regdb_transaction_start(void)
 486 {
 487         return (regdb->transaction_start(regdb) == 0) ?
 488                 WERR_OK : WERR_REG_IO_FAILURE;
 489 }
 490
 491 WERROR regdb_transaction_commit(void)
 492 {
 493         return (regdb->transaction_commit(regdb) == 0) ?
 494                 WERR_OK : WERR_REG_IO_FAILURE;
 495 }
 496
 497 WERROR regdb_transaction_cancel(void)
 498 {
 499         return (regdb->transaction_cancel(regdb) == 0) ?
 500                 WERR_OK : WERR_REG_IO_FAILURE;
 501 }
 502
 503 /***********************************************************************
 504  return the tdb sequence number of the registry tdb.
 505  this is an indicator for the content of the registry
 506  having changed. it will change upon regdb_init, too, though.
 507  ***********************************************************************/
 508 int regdb_get_seqnum(void)
 509 {
 510         return regdb->get_seqnum(regdb);
 511 }
 512
 513
 514 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
 515                                            const char *keyname,
 516                                            const char *prefix)
 517 {
 518         char *path;
 519         WERROR werr = WERR_NOMEM;
 520         TALLOC_CTX *mem_ctx = talloc_stackframe();
 521
 522         if (keyname == NULL) {
 523                 werr = WERR_INVALID_PARAM;
 524                 goto done;
 525         }
 526
 527         if (prefix == NULL) {
 528                 path = discard_const_p(char, keyname);
 529         } else {
 530                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
 531                 if (path == NULL) {
 532                         goto done;
 533                 }
 534         }
 535
 536         path = normalize_reg_path(mem_ctx, path);
 537         if (path == NULL) {
 538                 goto done;
 539         }
 540
 541         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
 542
 543         /* treat "not" found" as ok */
 544         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 545                 werr = WERR_OK;
 546         }
 547
 548 done:
 549         talloc_free(mem_ctx);
 550         return werr;
 551 }
 552
 553
 554 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
 555 {
 556         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
 557 }
 558
 559 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
 560 {
 561         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
 562 }
 563
 564 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
 565 {
 566         return regdb_delete_key_with_prefix(db, keyname, NULL);
 567 }
 568
 569 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
 570 {
 571         WERROR werr;
 572
 573         werr = regdb_delete_values(db, keyname);
 574         if (!W_ERROR_IS_OK(werr)) {
 575                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 576                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
 577                 goto done;
 578         }
 579
 580         werr = regdb_delete_secdesc(db, keyname);
 581         if (!W_ERROR_IS_OK(werr)) {
 582                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 583                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
 584                 goto done;
 585         }
 586
 587         werr = regdb_delete_subkeylist(db, keyname);
 588         if (!W_ERROR_IS_OK(werr)) {
 589                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 590                           keyname, win_errstr(werr)));
 591                 goto done;
 592         }
 593
 594 done:
 595         return werr;
 596 }
 597
 598 /***********************************************************************
 599  Add subkey strings to the registry tdb under a defined key
 600  fmt is the same format as tdb_pack except this function only supports
 601  fstrings
 602  ***********************************************************************/
 603
 604 static bool regdb_store_keys_internal(struct db_context *db,
 605                                       const char *key,
 606                                       struct regsubkey_ctr *ctr)
 607 {
 608         TDB_DATA dbuf;
 609         uint8 *buffer = NULL;
 610         int i = 0;
 611         uint32 len, buflen;
 612         bool ret = true;
 613         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 614         char *keyname = NULL;
 615         TALLOC_CTX *ctx = talloc_stackframe();
 616         NTSTATUS status;
 617
 618         if (!key) {
 619                 return false;
 620         }
 621
 622         keyname = talloc_strdup(ctx, key);
 623         if (!keyname) {
 624                 return false;
 625         }
 626         keyname = normalize_reg_path(ctx, keyname);
 627
 628         /* allocate some initial memory */
 629
 630         buffer = (uint8 *)SMB_MALLOC(1024);
 631         if (buffer == NULL) {
 632                 return false;
 633         }
 634         buflen = 1024;
 635         len = 0;
 636
 637         /* store the number of subkeys */
 638
 639         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 640
 641         /* pack all the strings */
 642
 643         for (i=0; i<num_subkeys; i++) {
 644                 size_t thistime;
 645
 646                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 647                                     regsubkey_ctr_specific_key(ctr, i));
 648                 if (len+thistime > buflen) {
 649                         size_t thistime2;
 650                         /*
 651                          * tdb_pack hasn't done anything because of the short
 652                          * buffer, allocate extra space.
 653                          */
 654                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 655                                                    (len+thistime)*2);
 656                         if(buffer == NULL) {
 657                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 658                                           "memory of size [%u]\n",
 659                                           (unsigned int)(len+thistime)*2));
 660                                 ret = false;
 661                                 goto done;
 662                         }
 663                         buflen = (len+thistime)*2;
 664                         thistime2 = tdb_pack(
 665                                 buffer+len, buflen-len, "f",
 666                                 regsubkey_ctr_specific_key(ctr, i));
 667                         if (thistime2 != thistime) {
 668                                 DEBUG(0, ("tdb_pack failed\n"));
 669                                 ret = false;
 670                                 goto done;
 671                         }
 672                 }
 673                 len += thistime;
 674         }
 675
 676         /* finally write out the data */
 677
 678         dbuf.dptr = buffer;
 679         dbuf.dsize = len;
 680         status = dbwrap_store_bystring(db, keyname, dbuf, TDB_REPLACE);
 681         if (!NT_STATUS_IS_OK(status)) {
 682                 ret = false;
 683                 goto done;
 684         }
 685
 686         /*
 687          * Delete a sorted subkey cache for regdb_key_exists, will be
 688          * recreated automatically
 689          */
 690         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
 691                                   keyname);
 692         if (keyname != NULL) {
 693                 dbwrap_delete_bystring(db, keyname);
 694         }
 695
 696 done:
 697         TALLOC_FREE(ctx);
 698         SAFE_FREE(buffer);
 699         return ret;
 700 }
 701
 702 /***********************************************************************
 703  Store the new subkey record and create any child key records that
 704  do not currently exist
 705  ***********************************************************************/
 706
 707 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
 708 {
 709         int num_subkeys, old_num_subkeys, i;
 710         char *path = NULL;
 711         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
 712         char *oldkeyname = NULL;
 713         TALLOC_CTX *ctx = talloc_stackframe();
 714         WERROR werr;
 715
 716         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
 717                 goto fail;
 718         }
 719
 720         /*
 721          * fetch a list of the old subkeys so we can determine if anything has
 722          * changed
 723          */
 724
 725         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 726         if (!W_ERROR_IS_OK(werr)) {
 727                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 728                 return false;
 729         }
 730
 731         regdb_fetch_keys(key, old_subkeys);
 732
 733         num_subkeys = regsubkey_ctr_numkeys(ctr);
 734         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 735         if ((num_subkeys && old_num_subkeys) &&
 736             (num_subkeys == old_num_subkeys)) {
 737
 738                 for (i = 0; i < num_subkeys; i++) {
 739                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
 740                                    regsubkey_ctr_specific_key(old_subkeys, i))
 741                             != 0)
 742                         {
 743                                 break;
 744                         }
 745                 }
 746                 if (i == num_subkeys) {
 747                         /*
 748                          * Nothing changed, no point to even start a tdb
 749                          * transaction
 750                          */
 751                         TALLOC_FREE(old_subkeys);
 752                         return true;
 753                 }
 754         }
 755
 756         TALLOC_FREE(old_subkeys);
 757
 758         if (regdb->transaction_start(regdb) != 0) {
 759                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 760                 goto fail;
 761         }
 762
 763         /*
 764          * Re-fetch the old keys inside the transaction
 765          */
 766
 767         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 768         if (!W_ERROR_IS_OK(werr)) {
 769                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 770                 goto cancel;
 771         }
 772
 773         regdb_fetch_keys(key, old_subkeys);
 774
 775         /*
 776          * Make the store operation as safe as possible without transactions:
 777          *
 778          * (1) For each subkey removed from ctr compared with old_subkeys:
 779          *
 780          *     (a) First delete the value db entry.
 781          *
 782          *     (b) Next delete the secdesc db record.
 783          *
 784          *     (c) Then delete the subkey list entry.
 785          *
 786          * (2) Now write the list of subkeys of the parent key,
 787          *     deleting removed entries and adding new ones.
 788          *
 789          * (3) Finally create the subkey list entries for the added keys.
 790          *
 791          * This way if we crash half-way in between deleting the subkeys
 792          * and storing the parent's list of subkeys, no old data can pop up
 793          * out of the blue when re-adding keys later on.
 794          */
 795
 796         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
 797
 798         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 799         for (i=0; i<num_subkeys; i++) {
 800                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 801
 802                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 803                         /*
 804                          * It's still around, don't delete
 805                          */
 806
 807                         continue;
 808                 }
 809
 810                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 811                 if (!path) {
 812                         goto cancel;
 813                 }
 814
 815                 werr = regdb_delete_key_lists(regdb, path);
 816                 W_ERROR_NOT_OK_GOTO(werr, cancel);
 817
 818                 TALLOC_FREE(path);
 819         }
 820
 821         TALLOC_FREE(old_subkeys);
 822
 823         /* (2) store the subkey list for the parent */
 824
 825         if (!regdb_store_keys_internal(regdb, key, ctr)) {
 826                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 827                          "for parent [%s]\n", key));
 828                 goto cancel;
 829         }
 830
 831         /* (3) now create records for any subkeys that don't already exist */
 832
 833         num_subkeys = regsubkey_ctr_numkeys(ctr);
 834
 835         if (num_subkeys == 0) {
 836                 werr = regsubkey_ctr_init(ctx, &subkeys);
 837                 if (!W_ERROR_IS_OK(werr)) {
 838                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 839                         goto cancel;
 840                 }
 841
 842                 if (!regdb_store_keys_internal(regdb, key, subkeys)) {
 843                         DEBUG(0,("regdb_store_keys: Failed to store "
 844                                  "new record for key [%s]\n", key));
 845                         goto cancel;
 846                 }
 847                 TALLOC_FREE(subkeys);
 848
 849         }
 850
 851         for (i=0; i<num_subkeys; i++) {
 852                 path = talloc_asprintf(ctx, "%s/%s",
 853                                         key,
 854                                         regsubkey_ctr_specific_key(ctr, i));
 855                 if (!path) {
 856                         goto cancel;
 857                 }
 858                 werr = regsubkey_ctr_init(ctx, &subkeys);
 859                 if (!W_ERROR_IS_OK(werr)) {
 860                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 861                         goto cancel;
 862                 }
 863
 864                 if (regdb_fetch_keys( path, subkeys ) == -1) {
 865                         /* create a record with 0 subkeys */
 866                         if (!regdb_store_keys_internal(regdb, path, subkeys)) {
 867                                 DEBUG(0,("regdb_store_keys: Failed to store "
 868                                          "new record for key [%s]\n", path));
 869                                 goto cancel;
 870                         }
 871                 }
 872
 873                 TALLOC_FREE(subkeys);
 874                 TALLOC_FREE(path);
 875         }
 876
 877         if (regdb->transaction_commit(regdb) != 0) {
 878                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 879                 goto fail;
 880         }
 881
 882         TALLOC_FREE(ctx);
 883         return true;
 884
 885 cancel:
 886         if (regdb->transaction_cancel(regdb) != 0) {
 887                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 888         }
 889
 890 fail:
 891         TALLOC_FREE(ctx);
 892
 893         return false;
 894 }
 895
 896 static WERROR regdb_create_subkey(const char *key, const char *subkey)
 897 {
 898         WERROR werr;
 899         struct regsubkey_ctr *subkeys;
 900         TALLOC_CTX *mem_ctx = talloc_stackframe();
 901
 902         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
 903                 werr = WERR_NOT_FOUND;
 904                 goto done;
 905         }
 906
 907         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 908         W_ERROR_NOT_OK_GOTO_DONE(werr);
 909
 910         if (regdb_fetch_keys(key, subkeys) < 0) {
 911                 werr = WERR_REG_IO_FAILURE;
 912                 goto done;
 913         }
 914
 915         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
 916                 werr = WERR_OK;
 917                 goto done;
 918         }
 919
 920         talloc_free(subkeys);
 921
 922         werr = regdb_transaction_start();
 923         W_ERROR_NOT_OK_GOTO_DONE(werr);
 924
 925         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 926         W_ERROR_NOT_OK_GOTO(werr, cancel);
 927
 928         if (regdb_fetch_keys(key, subkeys) < 0) {
 929                 werr = WERR_REG_IO_FAILURE;
 930                 goto cancel;
 931         }
 932
 933         werr = regsubkey_ctr_addkey(subkeys, subkey);
 934         W_ERROR_NOT_OK_GOTO(werr, cancel);
 935
 936         if (!regdb_store_keys_internal(regdb, key, subkeys)) {
 937                 DEBUG(0, (__location__ " failed to store new subkey list for "
 938                          "parent key %s\n", key));
 939                 werr = WERR_REG_IO_FAILURE;
 940                 goto cancel;
 941         }
 942
 943         werr = regdb_transaction_commit();
 944         if (!W_ERROR_IS_OK(werr)) {
 945                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
 946                          win_errstr(werr)));
 947         }
 948
 949         goto done;
 950
 951 cancel:
 952         werr = regdb_transaction_cancel();
 953         if (!W_ERROR_IS_OK(werr)) {
 954                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
 955                          win_errstr(werr)));
 956         }
 957
 958 done:
 959         talloc_free(mem_ctx);
 960         return werr;
 961 }
 962
 963 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
 964 {
 965         WERROR werr, werr2;
 966         struct regsubkey_ctr *subkeys;
 967         char *path;
 968         TALLOC_CTX *mem_ctx = talloc_stackframe();
 969
 970         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
 971                 werr = WERR_NOT_FOUND;
 972                 goto done;
 973         }
 974
 975         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
 976         if (path == NULL) {
 977                 werr = WERR_NOMEM;
 978                 goto done;
 979         }
 980
 981         if (!regdb_key_exists(path)) {
 982                 werr = WERR_OK;
 983                 goto done;
 984         }
 985
 986         werr = regdb_transaction_start();
 987         W_ERROR_NOT_OK_GOTO_DONE(werr);
 988
 989         werr = regdb_delete_key_lists(regdb, path);
 990         W_ERROR_NOT_OK_GOTO(werr, cancel);
 991
 992         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 993         W_ERROR_NOT_OK_GOTO(werr, cancel);
 994
 995         if (regdb_fetch_keys(key, subkeys) < 0) {
 996                 werr = WERR_REG_IO_FAILURE;
 997                 goto cancel;
 998         }
 999
1000         werr = regsubkey_ctr_delkey(subkeys, subkey);
1001         W_ERROR_NOT_OK_GOTO(werr, cancel);
1002
1003         if (!regdb_store_keys_internal(regdb, key, subkeys)) {
1004                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1005                          "parent key %s\n", key));
1006                 werr = WERR_REG_IO_FAILURE;
1007                 goto cancel;
1008         }
1009
1010         werr = regdb_transaction_commit();
1011         if (!W_ERROR_IS_OK(werr)) {
1012                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
1013                          win_errstr(werr)));
1014         }
1015
1016         goto done;
1017
1018 cancel:
1019         werr2 = regdb_transaction_cancel();
1020         if (!W_ERROR_IS_OK(werr2)) {
1021                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
1022                          win_errstr(werr2)));
1023         }
1024
1025 done:
1026         talloc_free(mem_ctx);
1027         return werr;
1028 }
1029
1030 static TDB_DATA regdb_fetch_key_internal(TALLOC_CTX *mem_ctx, const char *key)
1031 {
1032         char *path = NULL;
1033         TDB_DATA data;
1034
1035         path = normalize_reg_path(mem_ctx, key);
1036         if (!path) {
1037                 return make_tdb_data(NULL, 0);
1038         }
1039
1040         data = dbwrap_fetch_bystring(regdb, mem_ctx, path);
1041
1042         TALLOC_FREE(path);
1043         return data;
1044 }
1045
1046
1047 /**
1048  * check whether a given key name represents a base key,
1049  * i.e one without a subkey separator ('/' or '\').
1050  */
1051 static bool regdb_key_is_base_key(const char *key)
1052 {
1053         TALLOC_CTX *mem_ctx = talloc_stackframe();
1054         bool ret = false;
1055         char *path;
1056
1057         if (key == NULL) {
1058                 goto done;
1059         }
1060
1061         path = normalize_reg_path(mem_ctx, key);
1062         if (path == NULL) {
1063                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1064                 goto done;
1065         }
1066
1067         if (*path == '\0') {
1068                 goto done;
1069         }
1070
1071         ret = (strrchr(path, '/') == NULL);
1072
1073 done:
1074         TALLOC_FREE(mem_ctx);
1075         return ret;
1076 }
1077
1078 /*
1079  * regdb_key_exists() is a very frequent operation. It can be quite
1080  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1081  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1082  *
1083  * The following code tries to make this operation as efficient as possible:
1084  * Per registry key we create a list of subkeys that is very efficient to
1085  * search for existence of a subkey. Its format is:
1086  *
1087  * 4 bytes num_subkeys
1088  * 4*num_subkey bytes offset into the string array
1089  * then follows a sorted list of subkeys in uppercase
1090  *
1091  * This record is created by create_sorted_subkeys() on demand if it does not
1092  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1093  * list, the parsing code and the binary search can be found in
1094  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1095  * the potentially large subkey record.
1096  *
1097  * The sorted subkey record is deleted in regdb_store_keys_internal and
1098  * recreated on demand.
1099  */
1100
1101 static int cmp_keynames(const void *p1, const void *p2)
1102 {
1103         return StrCaseCmp(*((char **)p1), *((char **)p2));
1104 }
1105
1106 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1107 {
1108         char **sorted_subkeys;
1109         struct regsubkey_ctr *ctr;
1110         bool result = false;
1111         NTSTATUS status;
1112         char *buf;
1113         char *p;
1114         int i, res;
1115         size_t len;
1116         int num_subkeys;
1117         WERROR werr;
1118
1119         if (regdb->transaction_start(regdb) != 0) {
1120                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1121                           "failed\n"));
1122                 return false;
1123         }
1124
1125         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1126         if (!W_ERROR_IS_OK(werr)) {
1127                 goto fail;
1128         }
1129
1130         res = regdb_fetch_keys(key, ctr);
1131         if (res == -1) {
1132                 goto fail;
1133         }
1134
1135         num_subkeys = regsubkey_ctr_numkeys(ctr);
1136         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1137         if (sorted_subkeys == NULL) {
1138                 goto fail;
1139         }
1140
1141         len = 4 + 4*num_subkeys;
1142
1143         for (i = 0; i < num_subkeys; i++) {
1144                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1145                                         regsubkey_ctr_specific_key(ctr, i));
1146                 if (sorted_subkeys[i] == NULL) {
1147                         goto fail;
1148                 }
1149                 len += strlen(sorted_subkeys[i])+1;
1150         }
1151
1152         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1153
1154         buf = talloc_array(ctr, char, len);
1155         if (buf == NULL) {
1156                 goto fail;
1157         }
1158         p = buf + 4 + 4*num_subkeys;
1159
1160         SIVAL(buf, 0, num_subkeys);
1161
1162         for (i=0; i < num_subkeys; i++) {
1163                 ptrdiff_t offset = p - buf;
1164                 SIVAL(buf, 4 + 4*i, offset);
1165                 strlcpy(p, sorted_subkeys[i], len-offset);
1166                 p += strlen(sorted_subkeys[i]) + 1;
1167         }
1168
1169         status = dbwrap_store_bystring(
1170                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1171                 TDB_REPLACE);
1172         if (!NT_STATUS_IS_OK(status)) {
1173                 /*
1174                  * Don't use a "goto fail;" here, this would commit the broken
1175                  * transaction. See below for an explanation.
1176                  */
1177                 if (regdb->transaction_cancel(regdb) == -1) {
1178                         DEBUG(0, ("create_sorted_subkeys: transaction_cancel "
1179                                   "failed\n"));
1180                 }
1181                 TALLOC_FREE(ctr);
1182                 return false;
1183         }
1184
1185         result = true;
1186  fail:
1187         /*
1188          * We only get here via the "goto fail" when we did not write anything
1189          * yet. Using transaction_commit even in a failure case is necessary
1190          * because this (disposable) call might be nested in other
1191          * transactions. Doing a cancel here would destroy the possibility of
1192          * a transaction_commit for transactions that we might be wrapped in.
1193          */
1194         if (regdb->transaction_commit(regdb) == -1) {
1195                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1196                           "failed\n"));
1197                 goto fail;
1198         }
1199
1200         TALLOC_FREE(ctr);
1201         return result;
1202 }
1203
1204 struct scan_subkey_state {
1205         char *name;
1206         bool scanned;
1207         bool found;
1208 };
1209
1210 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1211                                  void *private_data)
1212 {
1213         struct scan_subkey_state *state =
1214                 (struct scan_subkey_state *)private_data;
1215         uint32_t num_subkeys;
1216         uint32_t l, u;
1217
1218         if (data.dsize < sizeof(uint32_t)) {
1219                 return -1;
1220         }
1221
1222         state->scanned = true;
1223         state->found = false;
1224
1225         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1226
1227         l = 0;
1228         u = num_subkeys;
1229
1230         while (l < u) {
1231                 uint32_t idx = (l+u)/2;
1232                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1233                 int comparison = strcmp(state->name, s);
1234
1235                 if (comparison < 0) {
1236                         u = idx;
1237                 } else if (comparison > 0) {
1238                         l = idx + 1;
1239                 } else {
1240                         state->found = true;
1241                         return 0;
1242                 }
1243         }
1244         return 0;
1245 }
1246
1247 static bool scan_parent_subkeys(const char *parent, const char *name)
1248 {
1249         char *path = NULL;
1250         char *key = NULL;
1251         struct scan_subkey_state state = { 0, };
1252         bool result = false;
1253         int res;
1254
1255         state.name = NULL;
1256
1257         path = normalize_reg_path(talloc_tos(), parent);
1258         if (path == NULL) {
1259                 goto fail;
1260         }
1261
1262         key = talloc_asprintf(talloc_tos(), "%s/%s",
1263                               REG_SORTED_SUBKEYS_PREFIX, path);
1264         if (key == NULL) {
1265                 goto fail;
1266         }
1267
1268         state.name = talloc_strdup_upper(talloc_tos(), name);
1269         if (state.name == NULL) {
1270                 goto fail;
1271         }
1272         state.scanned = false;
1273
1274         res = regdb->parse_record(regdb, string_term_tdb_data(key),
1275                                   parent_subkey_scanner, &state);
1276
1277         if (state.scanned) {
1278                 result = state.found;
1279         } else {
1280                 if (!create_sorted_subkeys(path, key)) {
1281                         goto fail;
1282                 }
1283                 res = regdb->parse_record(regdb, string_term_tdb_data(key),
1284                                           parent_subkey_scanner, &state);
1285                 if ((res == 0) && (state.scanned)) {
1286                         result = state.found;
1287                 }
1288         }
1289
1290  fail:
1291         TALLOC_FREE(path);
1292         TALLOC_FREE(state.name);
1293         return result;
1294 }
1295
1296 /**
1297  * Check for the existence of a key.
1298  *
1299  * Existence of a key is authoritatively defined by its
1300  * existence in the list of subkeys of its parent key.
1301  * The exeption of this are keys without a parent key,
1302  * i.e. the "base" keys (HKLM, HKCU, ...).
1303  */
1304 static bool regdb_key_exists(const char *key)
1305 {
1306         TALLOC_CTX *mem_ctx = talloc_stackframe();
1307         TDB_DATA value;
1308         bool ret = false;
1309         char *path, *p;
1310
1311         if (key == NULL) {
1312                 goto done;
1313         }
1314
1315         path = normalize_reg_path(mem_ctx, key);
1316         if (path == NULL) {
1317                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1318                 goto done;
1319         }
1320
1321         if (*path == '\0') {
1322                 goto done;
1323         }
1324
1325         p = strrchr(path, '/');
1326         if (p == NULL) {
1327                 /* this is a base key */
1328                 value = regdb_fetch_key_internal(mem_ctx, path);
1329                 ret = (value.dptr != NULL);
1330         } else {
1331                 *p = '\0';
1332                 ret = scan_parent_subkeys(path, p+1);
1333         }
1334
1335 done:
1336         TALLOC_FREE(mem_ctx);
1337         return ret;
1338 }
1339
1340
1341 /***********************************************************************
1342  Retrieve an array of strings containing subkeys.  Memory should be
1343  released by the caller.
1344  ***********************************************************************/
1345
1346 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1347 {
1348         WERROR werr;
1349         uint32 num_items;
1350         uint8 *buf;
1351         uint32 buflen, len;
1352         int i;
1353         fstring subkeyname;
1354         int ret = -1;
1355         TALLOC_CTX *frame = talloc_stackframe();
1356         TDB_DATA value;
1357
1358         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1359
1360         if (!regdb_key_exists(key)) {
1361                 goto done;
1362         }
1363
1364         werr = regsubkey_ctr_set_seqnum(ctr, regdb_get_seqnum());
1365         if (!W_ERROR_IS_OK(werr)) {
1366                 goto done;
1367         }
1368
1369         value = regdb_fetch_key_internal(frame, key);
1370
1371         if (value.dptr == NULL) {
1372                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1373                            key));
1374                 ret = 0;
1375                 goto done;
1376         }
1377
1378         buf = value.dptr;
1379         buflen = value.dsize;
1380         len = tdb_unpack( buf, buflen, "d", &num_items);
1381
1382         for (i=0; i<num_items; i++) {
1383                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1384                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1385                 if (!W_ERROR_IS_OK(werr)) {
1386                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1387                                   "failed: %s\n", win_errstr(werr)));
1388                         goto done;
1389                 }
1390         }
1391
1392         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1393
1394         ret = num_items;
1395 done:
1396         TALLOC_FREE(frame);
1397         return ret;
1398 }
1399
1400 /****************************************************************************
1401  Unpack a list of registry values frem the TDB
1402  ***************************************************************************/
1403
1404 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1405 {
1406         int             len = 0;
1407         uint32          type;
1408         fstring valuename;
1409         uint32          size;
1410         uint8           *data_p;
1411         uint32          num_values = 0;
1412         int             i;
1413
1414         /* loop and unpack the rest of the registry values */
1415
1416         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1417
1418         for ( i=0; i<num_values; i++ ) {
1419                 /* unpack the next regval */
1420
1421                 type = REG_NONE;
1422                 size = 0;
1423                 data_p = NULL;
1424                 valuename[0] = '\0';
1425                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1426                                   valuename,
1427                                   &type,
1428                                   &size,
1429                                   &data_p);
1430
1431                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1432
1433                 if (*valuename && size && data_p) {
1434                         regval_ctr_addvalue(values, valuename, type,
1435                                         (const char *)data_p, size);
1436                 }
1437                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1438
1439                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1440         }
1441
1442         return len;
1443 }
1444
1445 /****************************************************************************
1446  Pack all values in all printer keys
1447  ***************************************************************************/
1448
1449 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1450 {
1451         int             len = 0;
1452         int             i;
1453         struct regval_blob      *val;
1454         int             num_values;
1455
1456         if ( !values )
1457                 return 0;
1458
1459         num_values = regval_ctr_numvals( values );
1460
1461         /* pack the number of values first */
1462
1463         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1464
1465         /* loop over all values */
1466
1467         for ( i=0; i<num_values; i++ ) {
1468                 val = regval_ctr_specific_value( values, i );
1469                 len += tdb_pack(buf+len, buflen-len, "fdB",
1470                                 regval_name(val),
1471                                 regval_type(val),
1472                                 regval_size(val),
1473                                 regval_data_p(val) );
1474         }
1475
1476         return len;
1477 }
1478
1479 /***********************************************************************
1480  Retrieve an array of strings containing subkeys.  Memory should be
1481  released by the caller.
1482  ***********************************************************************/
1483
1484 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1485 {
1486         char *keystr = NULL;
1487         TALLOC_CTX *ctx = talloc_stackframe();
1488         int ret = 0;
1489         TDB_DATA value;
1490
1491         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1492
1493         if (!regdb_key_exists(key)) {
1494                 goto done;
1495         }
1496
1497         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1498         if (!keystr) {
1499                 goto done;
1500         }
1501
1502         values->seqnum = regdb_get_seqnum();
1503
1504         value = regdb_fetch_key_internal(ctx, keystr);
1505
1506         if (!value.dptr) {
1507                 /* all keys have zero values by default */
1508                 goto done;
1509         }
1510
1511         regdb_unpack_values(values, value.dptr, value.dsize);
1512         ret = regval_ctr_numvals(values);
1513
1514 done:
1515         TALLOC_FREE(ctx);
1516         return ret;
1517 }
1518
1519 bool regdb_store_values(const char *key, struct regval_ctr *values)
1520 {
1521         TDB_DATA old_data, data;
1522         char *keystr = NULL;
1523         TALLOC_CTX *ctx = talloc_stackframe();
1524         int len;
1525         NTSTATUS status;
1526         bool result = false;
1527
1528         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1529
1530         if (!regdb_key_exists(key)) {
1531                 goto done;
1532         }
1533
1534         ZERO_STRUCT(data);
1535
1536         len = regdb_pack_values(values, data.dptr, data.dsize);
1537         if (len <= 0) {
1538                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1539                 goto done;
1540         }
1541
1542         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1543         data.dsize = len;
1544
1545         len = regdb_pack_values(values, data.dptr, data.dsize);
1546
1547         SMB_ASSERT( len == data.dsize );
1548
1549         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1550         if (!keystr) {
1551                 goto done;
1552         }
1553         keystr = normalize_reg_path(ctx, keystr);
1554         if (!keystr) {
1555                 goto done;
1556         }
1557
1558         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1559
1560         if ((old_data.dptr != NULL)
1561             && (old_data.dsize == data.dsize)
1562             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1563         {
1564                 result = true;
1565                 goto done;
1566         }
1567
1568         status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1569
1570         result = NT_STATUS_IS_OK(status);
1571
1572 done:
1573         TALLOC_FREE(ctx);
1574         return result;
1575 }
1576
1577 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1578                                 struct security_descriptor **psecdesc)
1579 {
1580         char *tdbkey;
1581         TDB_DATA data;
1582         NTSTATUS status;
1583         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1584         WERROR err = WERR_OK;
1585
1586         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1587
1588         if (!regdb_key_exists(key)) {
1589                 err = WERR_BADFILE;
1590                 goto done;
1591         }
1592
1593         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1594         if (tdbkey == NULL) {
1595                 err = WERR_NOMEM;
1596                 goto done;
1597         }
1598         normalize_dbkey(tdbkey);
1599
1600         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1601         if (data.dptr == NULL) {
1602                 err = WERR_BADFILE;
1603                 goto done;
1604         }
1605
1606         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1607                                      psecdesc);
1608
1609         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1610                 err = WERR_NOMEM;
1611         } else if (!NT_STATUS_IS_OK(status)) {
1612                 err = WERR_REG_CORRUPT;
1613         }
1614
1615 done:
1616         TALLOC_FREE(tmp_ctx);
1617         return err;
1618 }
1619
1620 static WERROR regdb_set_secdesc(const char *key,
1621                                 struct security_descriptor *secdesc)
1622 {
1623         TALLOC_CTX *mem_ctx = talloc_stackframe();
1624         char *tdbkey;
1625         WERROR err = WERR_NOMEM;
1626         TDB_DATA tdbdata;
1627
1628         if (!regdb_key_exists(key)) {
1629                 err = WERR_BADFILE;
1630                 goto done;
1631         }
1632
1633         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1634         if (tdbkey == NULL) {
1635                 goto done;
1636         }
1637         normalize_dbkey(tdbkey);
1638
1639         if (secdesc == NULL) {
1640                 /* assuming a delete */
1641                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1642                                                                       tdbkey));
1643                 goto done;
1644         }
1645
1646         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1647                                                    &tdbdata.dptr,
1648                                                    &tdbdata.dsize));
1649         W_ERROR_NOT_OK_GOTO_DONE(err);
1650
1651         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1652                                                              tdbdata, 0));
1653
1654  done:
1655         TALLOC_FREE(mem_ctx);
1656         return err;
1657 }
1658
1659 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1660 {
1661         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1662 }
1663
1664 bool regdb_values_need_update(struct regval_ctr *values)
1665 {
1666         return (regdb_get_seqnum() != values->seqnum);
1667 }
1668
1669 /*
1670  * Table of function pointers for default access
1671  */
1672
1673 struct registry_ops regdb_ops = {
1674         .fetch_subkeys = regdb_fetch_keys,
1675         .fetch_values = regdb_fetch_values,
1676         .store_subkeys = regdb_store_keys,
1677         .store_values = regdb_store_values,
1678         .create_subkey = regdb_create_subkey,
1679         .delete_subkey = regdb_delete_subkey,
1680         .get_secdesc = regdb_get_secdesc,
1681         .set_secdesc = regdb_set_secdesc,
1682         .subkeys_need_update = regdb_subkeys_need_update,
1683         .values_need_update = regdb_values_need_update
1684 };